22 people wounded in the Kabul bomb blast

Afghan policemen inspect the wreckage of a bus hit by a suicide attack in Kabul January 26, 2014. A suicide bomber attacked an Afghan army bus in the capital, Kabul, on Sunday, killing three people and wounding at least 10, police said. The attack, the latest in a worrying upsurge of violence in Kabul and around Afghanistan, was claimed by the Taliban. REUTERS/Omar Sobhani (AFGHANISTAN - Tags: CIVIL UNREST) - RTX17UP9 (REUTERS)

An Afghan official says a suicide bomber has attacked a military bus in Kabul, killing at least four people.

Gen. Mohammad Zahir Azimi, spokesman for the Defense Ministry, said the bomber waited on foot Sunday in the east of the city for the bus to arrive before setting off his explosives. He said the dead included two soldiers and two civilians, one of whom was a woman. He says 22 others were wounded.

Taliban spokesman Zabihullah Mujahid claimed responsibility for the attack in an email sent to media